|Publication number||US7340613 B2|
|Application number||US 10/264,377|
|Publication date||Mar 4, 2008|
|Filing date||Oct 4, 2002|
|Priority date||Oct 5, 2001|
|Also published as||CN1280810C, CN1410989A, CN1825456A, CN1825456B, US7856560, US20030086567, US20080141038|
|Publication number||10264377, 264377, US 7340613 B2, US 7340613B2, US-B2-7340613, US7340613 B2, US7340613B2|
|Inventors||Hiroo Okamoto, Manabu Sasamoto, Atsushi Yoshioka|
|Original Assignee||Hitachi, Ltd.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (10), Referenced by (3), Classifications (33), Legal Events (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1. Field of the Invention
The present invention relates to an information recording apparatus for recording digital information such as video, voice, etc., or an information recording/reproducing apparatus for the same, and more particularly, the present invention relates to an apparatus for limiting recording of the digital information onto a recording media upon authorities given by the copyright holders, etc.
2. Description of Related Art
Now that digital TV broadcasting is started, various private-use digital recording/reproducing apparatuses have been put on the market in such package media fields as movie software, etc. so as to cope with such digital broadcasting contents. In the near future, package software to be used for those apparatuses is also expected to appear on the market. The most attractive advantage of such digital broadcasting and digital recording apparatuses is that no or almost no quality degradation is recognized in the respective processes of sending/recording/reproducing. And accordingly, a serious problem comes to arise from such the advantage of those digital apparatuses; a lot of illegal copies are generated from the high quality digital information of the originals with use of those apparatuses, and are sold where the copyright holders do not know, so that no profit is turned back to the copyright holders.
In order to solve such the problem, U.S. Pat. No. 5,896,454 discloses a method for adding 2-bit copy control information to every information item. According to this method, the operation of a recording apparatus is controlled so that any one of the three choices “Copy Never”, “Copy Free”, and “Copy One Generation” is permitted or selected. The recording apparatus does not work when “Copy Never” is set and starts recording when “Copy Free” is set. If “Copy One Generation” of copies is permitted, the recording apparatus carries out the recording operation after rewriting this control information to “No More copies”.
If “Copy Never” is set for the copy control information when in broadcasting, a problem might arise; for example, when the user has a visitor while watching/listening broadcast contents, the user might miss the contents and have no means for watching/listening them later. For example, Japanese Patent Laying-Open No. 2000-149417 (JP-A149417/2000) discloses a method for solving this problem by means of “Temporary Recording” even when “Copy Never” is set for the copy control information. This is a method for recording physically the desired information on a recording medium once, then the user is enabled to watch/listen the reproduced information for a predetermined period, for example, for just 90 minutes and the information is erased after that. This limit time is called as “retention period”. In other words, the method disables the information to be stored for a long time and used in other ways or purposes; it is just equivalent to enabling the broadcast content to be watched/listened with delaying a time within 90 minutes. This method can solve the above-described inconvenience of the user, since the recorded information is not stored for a long time, so that the copyright holder's advantages and/or profits can be protected. The “Temporary Recording” is often set in a hard disk recorder built in the receiver due to the characteristics thereof.
The similar “Temporary Recording” is available also when the copy control information indicates the “Copy One Generation”. For example, with provision of a limit, such as of 90 minutes, or the like, and while allowing the copy control information on the recording medium to indicate the “Copy One Generation” during the time limit, it is rewritten to the “No More Copy” after a lapse of the time limit. With this, it is also possible to obtain the effect of delaying the broadcasting, for example by 90 minutes, substantially.
After being rewritten into the “No More Copy”, it is impossible to copy the information from the disc onto the tape, for example, even if trying to do so. However, this sometimes gives inconvenience to the user. Then, subjecting to the condition that the information on the original recording medium is made to be non-reproducible, it is permitted to re-record (i.e., move) the information only onto other one recording medium. Thus, exchange-over of the recording media can be made, but without increasing the number of the recording media, i.e., without giving disadvantages onto the copyright holders.
The above mentioning disclosed in the those conventional arts has a function to put the brakes in a certain degree, on the illegal copying produced by combining plural number of the recording/reproducing apparatuses or recording apparatuses, thereby not providing disadvantages to the copyright holders. However in recent years, the apparatus using the hard disk is increasing in the number thereof, as was mentioned in the above. With such the apparatuses, for a person having a knowledge at a certain degree, it is possible to copy all the information onto the other hard disk, easily by a unit of one (1) bit, completely regardless of the copy control information.
For example, the “moving” operation mentioned above is allowed to the information, originally of “Copy One Generation”, even after being recorded on the medium, being changed into “No More Copy”, upon the assumption that the information on the original recording medium is made to be irreproducible, thereby not increasing the number of the recording media thereof. If the hard disk is removed and mounted onto the PC under the condition that the information of “No More Copy” is recorded thereon, it is possible to copy the information onto other hard disk under the condition of “No More Copies”. And, if this is mounted onto the original recording/reproducing apparatus, it means that, not only the information can be reproduced to be watched/listened, but also copy media can be produced in the number of copying thereof onto the hard disks. With this, the assumption of “moving” is destroyed, so that the creators and the copyright holders are suffered with disadvantages.
Of course, such the problem will occur, in the same manner, not only in the case where the recording medium is the hard disk, but also in the case where it is that which is originally made to be removable from the apparatus, for example, an optical disc, such as a CR-RW, or a DVD-RAM, etc., by mounting it onto the drive connected to the PC so as to copy the information to the other recording medium by a unit of one (1) bit.
Accordingly, an object of the present invention is, by taking the problems mentioned above into the consideration, to provide a means for preventing the recording media for the information of “No More Copies” from increasing in the number thereof, even when the hard disk is removed from the apparatus, and also an apparatus, into which is applied such the means.
For accomplishing such the object as was mentioned above, according to the present invention, there is provided a digital information recording apparatus provided with a recording medium drive mounting a recording medium therein, and a device for recording the digital information thereon, comprising: a first encryption key generator circuit for generating at least one of a unique number to said device and a unique number to a user of said device; a second encryption key generator circuit for generating a unique number to said recording medium drive; an encryption circuit for encrypting the digital information inputted to said device, with using both said first encryption key and said second encryption key; and a recording circuit for recording an output of said encryption circuit onto said recording medium.
Further, according to the present invention, there is provided a digital information recording and reproducing apparatus provided with a recording medium drive mounting a recording medium therein, and a device for recording and reproducing the digital information, comprising: a first encryption key generator circuit for generating at least one of a unique number to said device and a unique number to a user of said device; a second encryption key generator circuit for generating a unique number to said recording medium drive; an encryption circuit for encrypting the digital information inputted to said device, with using both said first encryption key and said second encryption key; a recording circuit for recording an output of said encryption circuit; a reproducing circuit for reproducing the digital signal from said recording medium; and a decryption circuit for decrypting said reproduced digital information with using both said first encryption key and said second encryption key.
Also, for accomplishing the above object, according to the present invention, there is further provided a digital recording and reproducing apparatus for recoding and reproducing digital information onto and from a recording medium, comprising: a recording and reproducing circuit for recording and reproducing the digital information onto and from said recording medium, with information relating to recording history onto said recording medium; an information management circuit for storing said information relating to the recording history; and a control circuit for controlling said recording and reproducing circuit and outputting operation thereof, wherein said control circuit compares the information relating to the recording history, which is reproduced from the recording medium, to the information relating to the recording history, which is read out from said information management circuit, whereby controlling to output the information reproduced from said recording medium as a usable information if they are coincident with, while to stop reproducing operation of the information from said recording medium, or operation of outputting the reproduced information as the usable information. Wherein, the information relating to the recording history is, preferably, a version information, which is changed when changing the content recorded onto the recording medium.
These and other objects, features and advantages of the present invention will become more readily apparent from the following detailed description when taken in conjunction with the accompanying drawing wherein:
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying.
While the present invention relates, in particular to digital information recording apparatus or a recording/reproducing apparatus, the whole system to which the present invention applies will be described in prior to the explanation of the apparatus.
The information supply station 1 such as a broadcasting station sends signal waves modulated by information via the relay station 2 such as a broadcasting satellite. The signal waves may also be sent via cables, telephones, and land broadcasting, of course. The signal waves received by the receiver 3 at the receiving part is demodulated to information signals as will be described later, and then recorded as proper signals in the first recording/reproducing apparatus 4 and/or the second recording/reproducing apparatus 6 as needed. The signals are also sent to the display 5. Thus, the user can watch/listen the information directly on the display 5. In addition, the information reproduced by the first recording/reproducing apparatus 4 and/or the second recording/reproducing apparatus 6 is outputted onto the display 5 via the receiver 3, thereby the user can obtain restored original video/voice information. When the user obtains information recorded beforehand on a removable recording medium, for example, as package software, the medium is set, for example, in the second recording/reproducing apparatus 6 and the subsequent operations that follow the reproduction are executed in the apparatus 6. Although digital signals are usually sent/received between apparatuses, analog signals are also sent/received between, for example, the receiver 3 and the display 5.
Video/voice information, etc. generated in the source generator 11 constituted of a camera, a recording/reproducing apparatus, etc., is compressed by the encoding circuit 12 so that it can be sent in a less-occupied band. The video/voice information is also encrypted in the scrambling circuit 13 so that only specific users can watch/listen the information. The information, after being modulated in the modulation circuit 14 into signals to be sent more appropriately, is emitted as radio waves to the relay station 2 such as a broadcasting satellite from the transmission antenna 15. At this time, the management information adding circuit 16 adds the above-described copy control information, as well as other information such as the current time, etc. to the received information waves. The input terminal 17 receives request information, etc. received via a telephone line, etc. although it is not illustrated in
Actually, however, a plurality of information items are often multiplexed in one radio wave by means of spectrum diffusion, etc. Although not shown in
Hereinafter, the flow of video/voice information indicated by a solid line will be described first with respect to the component elements 301 to 310. The RF/IF conversion circuit 301 receives radio waves transferred from such a relay station as a broadcasting satellite, etc. The frequency of the radio waves in the RF band is converted into an IF band (Intermediate Frequency) frequency or signals within a fixed band independent of the receiving channel. The signals are then demodulated in the demodulation circuit 302 so as to be sent out. Then, code errors that are generated during the transmission are detected and corrected in the error correction circuit 303, then decrypted in the descramble circuit 304. After this, those signals are sent to the first and second demultiplexing circuits 305 and 307. As described above, especially for digital broadcasting, a plurality of information items are often multiplexed in one channel with use of a method of time-division, spectrum diffusion, etc. The demultiplexing circuit is used to separate only desired information from those multiplexed information items. The reason why two demultiplexing circuits are provided in the system is to enable a competing program in the same time-shot to be recorded and enable the first demultiplexing circuit 305 to remove unnecessary worthless information. In other words, such additional information as weather report, program schedule, etc. are often added to the information and such the information is worthy only at that time of broadcasting; they are not worthy to record, so it is erased here.
The output of the first demultiplexer circuit 305 is connected to the first recording/reproducing apparatus 4 so as to be recorded on the recording media therein as needed. The input/output terminal 306 is a bi-directional terminal used to send/receive such digital data to record/reproduce to/from the second recording/reproducing apparatus 6. Generally, the IEEE1394 standard is employed for such the terminal connection. As described above, the second demultiplexer circuit 307 receives information sent from the descramble circuit circuit 304, information reproduced by the first recording/reproducing apparatus 4, or information reproduced by the second recording/reproducing apparatus 6 and sent via the input/output terminal 306. The second demultiplexer circuit 307 can thus select any of those information items and separates the desired information from them. The next decoder circuit 308 decodes motion picture data compressed in prior to the transmission and sends the decoded data to an external apparatus via the output terminal 309/310. The digital broadcasting described above handles HD (High Definition) information having as many as more than 1000 scanning lines and SD (Standard Definition) information having about 500 scanning lines. When the former is defined as HD output and the latter is defined as SD output to correspond to such the two types of information, information from the output terminal 309 may be supplied to HD type displays and information from the output terminal 310 to SD type displays respectively. The information from the output terminals 309 and 310 may be varied such way between digital and analog in accordance with the input of the target display.
Next, the control signal indicated by a dotted line will be described. The control circuit 311 sends/receives control signals to/from each component element (301 to 305, 307 and 308) to control the receiver 3 to execute desired operations. The information management circuit 312 supplies management data to the control circuit 311 in response to the request therefrom. For example, the management circuit 312 manages information of receiving contracts. When a user specifies a desired channel, this specification or instruction is inputted to the input terminal 314 and sent to the control circuit 311 via the command input circuit 313. The control circuit 311 then requests the information of the user's receiving contract to the information management circuit 312. When the user specified channel is contracted, the management circuit 312 sends a control signal to each component element described above to enable the user to receive the channel contents. The information management circuit 312 also manages information of timer reservation by each user. When a reserved time is reached, the control circuit 311 sends a control signal to each component element described above to start a receiving operation.
When the first recording/reproducing apparatus 4 is built in the receiver 3, information is recorded/reproduced according to the user's instruction received via the input terminal 314. This user's instruction is given to the control circuit 311 via the command input circuit 313, to control operation of the first recording/reproducing apparatus 4. Also, as will be mentioned later, sometimes, the control circuit 311 and the first recording/reproducing apparatus 4 may deliver version information of the recording medium, i.e., the hard disk, for example, with each other, depending on other embodiment of the present invention.
Next, the recording/reproducing operation of the digital recording/reproducing apparatus will be described with reference to
At first, the operation of the recording circuit 41 of the recording/reproducing apparatus will be described with reference to
This information is also supplied to the second recording/reproducing apparatus 6 via the input/output terminal 306. In addition, the information reproduced by the reproduction circuit 42 (will described later) and output from the output terminal 4209 is also supplied to the input/output terminal 306 shown in
Received information is stored in circuits in the storage means 4102. Video/voice digital information, as well as various control information items, which will be shown in
On the other hand, video/voice information outputted from the storage 4102 is encrypted, as needed, in the encryption circuit 4103 in accordance with the control signal received from the recording control circuit 4109. Herein is shown an example, in which the encryption is conducted upon the basis of the encryption keys received from the first encryption key generator circuit 4104 and the input terminal of the second encryption key. The former generates a device key, such as an apparatus identification number, etc., and a user key, such as a personal ID read from a user IC card loaded in the apparatus, etc. As will be shown in
Encrypted information is transferred to the encoder circuit 4105. The encoder circuit 4105 shuts off information that is not to be recorded in accordance with the control information received from the control circuit 4109. For the information to be recorded, the encoder circuit 4105 modulates the information in accordance with the medium to be used, and then outputs the modulated information to the output terminal 4106.
In addition to the copy control information, the control circuit 4109 also sends the current recording time output from the clock to the encoder circuit 4105. This current recording time is recorded together with the information to be recorded. The current clock time, when it is included in received information, may be used as it is. The clock 4211 may be calibrated or corrected by the received information.
Furthermore, the information signal outputted from the output terminal 4106 is transferred to the input terminal 4301 of the recording/reproducing circuit 43 shown in
The output of the recording control circuit 4109 shown in
Next, how to reproduce recorded information in the recording/reproducing apparatus will be described. An information signal reproduced from the recording media drive shown in
Information signals outputted from the output terminal 4305, shown in
On the other hand, the control signal detector circuit 4210 detects the copy control information, recording time, etc., from the error-corrected data described above. Then, the reproduction control circuit 4212 decides on whether to output or not the reproduced data according to those information items and the current time obtained from the clock 4211 to control the output of the signal output circuit 4208. The reproduction control circuit 4212 may also start or stop the decryption circuit 4206. For example, a reproduction/watching period is limited as described above, and when this period is over, the signal output circuit 4208 is controlled not to output at least information that can be watched/listened normally. The control information may also be sent from the output terminal 4214 to the input terminal 4307 shown in
When reproduced information output is authorized, including items, such as a version information of the hard disk drive, which will be mentioned later, for example, the information is outputted to the output terminal 4209, then onto the display 5 via the receiver 3 shown in
When the copy control information is different from that having been described so far, and it is embedded in video information as an electronic “water mark”, the same controlling can be made with use of the information detected from this electronic “water mark” at the time of reproduction.
The clock 4211 is naturally required to be of a certain level of accuracy in its operation. Since it is impossible to achieve the object thereof, if the user can change the time easily, with malicious intent. The time should preferably be controlled with the time information received from a broadcasting station, etc. The recording/reproducing apparatus may be configured so that when the time is changed intentionally, the apparatus operation is disabled.
The input/output terminal 4213 sends/receives the control information to/from external apparatuses or the control circuit 311 shown in
Control signals sent from the reproduction control circuit 4212 to the encoder circuit 4105 are used, for example, to specify erasing of information at the time of reproduction. Concretely, the control signal is used to erase the information that has passed the limit time for watching/listening, or the information that is reproduced once regardless of the limit time. When “moving” some information reproduced to other medium, the information must be erased after being reproduced once. The control signal is also used to erase such the information. When a disk is used as a recording medium, the encoder circuit 4105 generates meaningless signals as information in accordance with this control signal and records the signals, thereby erasing the target information. Alternatively, the control signal may be made unable substantially, by deleting a part thereof. In this case, it is premised that data is erasable from the recording media. The media detector circuit 4107 is prepared for such the processing. The above method is effective for such apparatuses as the second recording/reproducing apparatus 6 that uses removable recording media therein. When recording some information on a condition that the information is to be erased later, the recording is disabled for apparatuses that employ such non-erasable media as CD-R, etc. Similarly, reproduction is disabled for “moving” information from such the non-erasable media. The media detector circuit 4107 sends a control signal to the encoder circuit 4105 and the reproduction control circuit 4212, so as to disable the operations thereof. However, the media detector circuit 4107 is not needed in the case where it is not premised that the recording medium is removable one, as in the first recording/reproducing apparatus 4. This completes the description of the basic reproducing operations with reference to
Next, explanation will be made on effects, according to the embodiment of the present invention, which was shown in
Next, explanation will be given on the operations and the effects of the embodiment, being separate from that mentioned above, to which the present invention is also applied, by referring to
With the operations mentioned above, it is impossible to reproduce the information to be used, which is once copied onto the other hard disc drive by mounting the recording/reproducing portion 43 onto the PC, even if it is mounted onto the first recording/reproducing apparatus 4. Also, if the information once copied onto the other hard disk drive is turned back to the original hard disk drive, again, it is impossible to reproduce it to be used. This is because the information relating to the recording history, such as the version information, etc., is renewed when the information is copied onto the other hard disk drive through the PC or the like, and therefore, if trying to reproduce, the reproduced version information is not coincident with the version information which was memorized in the information management circuit 312. For this reason, the information on the hard disk cannot be used as an available one if it is copied onto the other hard disk drive once, irrespective of the content of the copy control information, and therefore bringing about an effect of inhibiting an increase of the number of the recording media through the “moving” operation. Consequently, it is difficult to destroy or loose the primary or basic idea of “moving”, i.e., only changing over the recording media to be used but without increasing the number of the recording media, thereby bringing about the effect that the advantages of the creators and the copyright holders of the information can be protected.
Further, in the embodiment shown in
For an ordinary user, who uses the information but without removing the hard disk drive, the version information recorded in the management region on the hard disk and the version information memorized in the information management circuit 312 are changed, at the same time, every time when new information is recorded additionally, or when the recorded information is deleted. Accordingly, those operations do not bring the information recorded on the hard disk to be un-reproducible and unavailable. Thus, it has a function to give a change in the information recorded on the hard disk, or to prevent it from being reproduced by mounting the hard disk onto the other hard disk derive.
Although the information memorized in the information management circuit 312 is described to be the version information, for example, in the explanation given in the above, however the present invention should not be restricted only to this. Thus, it may be any kind if it indicates the recording process or history of the recording medium, such as the directory information indicative of the contents recorded on the recording medium, i.e., what kind of information is recorded therein, the information of the date and times when the content recorded is renewed lastly, etc., for example. Also, though the explanation was made that the recording/reproducing portion 43 shown in
Next, description will be made on other embodiment, according to the present invention. In this case, the encryption key from the input terminal 4207 shown in
Next, explanation will be given on the case where the device for memorizing therein the version information or the like is not built in the receiver 3, but it is attached on an outside thereof, by referring to the circuit block diagram shown in
Furthermore, irrespective of that it is the user key or not, assuming that the encryption key is generated in the board 7, then the object can be achieved if erasing the encryption key on the board 7, when the information is erased from the original medium by “moving” the information from the recording medium to other medium. Thus, the erasing can be simplified in the operation thereof. Of course, also in the case where the encryption key is generated in the information management circuit 3, as shown in
In the explanation given in the above, description was mainly made on the subject, i.e., the first recording/reproducing apparatus 4, which is built in the receiver 3, however the present invention may be applied to the second recording/reproducing apparatus 6, equally, which is attached on the outside thereof.
Next, description will be made on the contents shown in
Sector information 101 is a sector number of a program divided by a predetermined unit when it is recorded on the medium. The program may be divided into a fixed unit, such as in units of 2K bytes or a unit of information, for example, a unit of dividing at the time of encoding. The number may also be assigned in the subject program and it may be a serial number on the whole recording medium. Such information as a recording time 107 b (to be described later) is added for each sector.
Time information 102 indicates a progress of the recording; it indicates a portion of a program up to which the recording is completed. The above information is added when some information is recorded on the medium.
A type 103 b indicates attribute information for indicating that the program is sold, rented, created by the user himself/herself, or recorded from broadcasting. As is shown by a reference numeral 103 a in
Next, a copy control 104 a in
APS 105 a is copy control information (APS; Analogue Protection System equivalent to an analog copy control signal). This information, as is described in Japanese Patent Laying-Open No. Sho 61-288582 (JP-A 288582/1986), for example, is used to control whether to enable copying to an analog recording apparatus, for example, by adding a pseudo pulse to each analog video signal. The information may be recorded as it is, as the APS 105 b.
Pause 106 a indicates whether to enable “Temporary Recording” when “Copy Never” is set for the copy control information 104 a. The “Temporary Recording” is referred to as a pausing function, since it functions just like pausing of broadcasting only for a period. For example, when “Temporary Recording” is enabled, “0” is set and when it is disabled, “1” is set, so that information sending can be controlled with one bit. Consequently, the copyright holder can manage whether to enable “Temporary Recording”.
In addition, “Temporary Recording” may be enabled for “Copy One Generation (one generation of copies is permitted)” so as to use this bit to control whether to enable “Temporary Recording”. When “1” is set to disable “Temporary Recording”, the copy control information is updated to “Copy No More” for recording information. When “0” is set to enable “Temporary Recording”, recording is done while the copy control information “Copy One Generation (one generation of copies is permitted)” is kept as it is or it is updated to “Copy No More”, then updated to “Copy One Generation (one generation of copies is permitted)” in the signal output circuit 4208 shown in
In any case, when “0” is set to enable “TemporaryRecording”, the “0” may be updated to “1” in the encoder circuit 4105, etc. to record information. This can solve the problem of repeating of “Temporary Recording” in other apparatuses within a limit time.
A time element 107 a indicates, for example, the current time of broadcasting set by the management information adding circuit 16 shown in
A broadcasting method 108 a indicates a broadcasting method HD (High Definition) information, SD (Standard Definition) information, etc. used for subject information. This information may be recorded as the information 108 b as it is.
A pausing time 109 a indicates a limit element within which subject content can be reproduced and watched/listened after “Temporary Recording” when “Copy Never” is set for the copy control information. Generally, the limit time is as short as 90 or 120 minutes, so that the user will feel inconvenience sometimes. For example, when “Temporary Recording” is done at midnight, the user must finish watching/listening of the recorded content before she/he goes to bed. To avoid such a trouble, for example, a 3-bit value can be set for the Pause time 109 a so that various times can be set. For example, “001” can be set for 90 minutes, “010” for one day, “011” for one week, “100” for one month, “101” for half a year, “110” for one year, and “111” for limitless. Consequently, such the user's feeling of inconvenience caused by the short pausing time can be eliminated under the management of the copyright holder. Such the 3-bit value may be used as the element 109 b for recording. This 3-bit information may also be used for “Copy One Generation (one generation of copies is permitted)” that disables “Temporary Recording”. In this case, after the “Temporary Recording”, the copy control information 104 b is kept to be “Copy One Generation (one generation of copies is permitted)” for this period, and then the 104 b information is updated to “Copy No More” when the limit time is up. The copy control information 104 b may also be updated to “Copy No More” for recording, then it is updated to “Copy One Generation (one generation of copies is permitted)”, for example, in the signal output circuit 4208 shown in
Encryption information 111 is often used to reproduce encrypted recorded information and decrypt the encryption. When there is much data, the code numbers may be recorded and used to reproduce the corresponding information items stored beforehand in the apparatus.
The user identification information 110 and the encryption information 111 are added when information is to be recorded. However, there is no necessity of recoding them on the recording medium, since the keys to be used for decrypting the encrypted information are generated in the first and the second encryption key generator circuits 4104 and 4108, mainly in the embodiments according to the present invention.
The above information items are recorded at comparatively short time intervals, for example, for each frame of video data, a fixed amount of data, or the like as needed. The configuration of a control information signal shown in
As described above, according to the present invention, in the recording/reproducing apparatus, which uses the hard disk as the recording medium therein, if trying to reproduce the information by removing the hard disc drive from the recording/reproducing apparatus, thereby to mount it onto the PC to copy it onto the second hard disk drive, and then by mounting the second hard disk drive back to the original recording/reproducing apparatus, again, for reproduction thereof, however since the encryption cannot be decrypted, therefore the reproduced information cannot be watched nor listened normally. Also, according to the present invention, even if the information is copied from the second hard disk drive, turning back to the original hard disk, the encryption cannot be decrypted in the same manner, therefore reproduced information cannot be watched nor listened normally. Accordingly, it is possible to prevent the number of the recording media from increasing due to repetitive “moving” of the information of “No More Copy”. And, according to this, the primary or basic idea of “moving”, i.e., only changing over between the recording media to be use, can be protected from being destroyed or lost, but without increase in the number of the recording media. Also, according to the present invention, the action of copying by removing the hard disk drive to be mounted to the PC has no meaning by itself, therefore the profits of the creator and the copyright holder of the information can be protected more completely and satisfactorily.
The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present invention embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the forgoing description and range of equivalency of the claims are therefore intended to be embraced therein.
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|U.S. Classification||713/193, G9B/20.002|
|International Classification||G06F21/62, G06F21/10, H04N5/765, G11B20/10, G11B20/00, H04N5/781, H04N7/08, H04N7/081, H04N5/91, G06F12/14, H04L9/32|
|Cooperative Classification||G11B20/0021, G11B20/00246, G11B20/00768, G11B20/00188, G11B20/00231, G11B20/00536, G11B20/00086, G11B20/00137, G11B20/00413, G11B20/0084|
|European Classification||G11B20/00P5G1F, G11B20/00P11E, G11B20/00P5A7, G11B20/00P5, G11B20/00P4, G11B20/00P5A3, G11B20/00P2, G11B20/00P11B1B, G11B20/00P5A5, G11B20/00P|
|Jan 13, 2003||AS||Assignment|
Owner name: HITACHI, LTD., JAPAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OKAMOTO, HIROO;SASAMOTO, MANABU;YOSHIOKA, ATSUSHI;REEL/FRAME:013655/0337;SIGNING DATES FROM 20021126 TO 20021127
|Aug 3, 2011||FPAY||Fee payment|
Year of fee payment: 4
|Jun 12, 2013||AS||Assignment|
Owner name: HITACHI CONSUMER ELECTRONICS CO., LTD., JAPAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HITACHI, LTD.;REEL/FRAME:030802/0610
Effective date: 20130607
|Sep 8, 2014||AS||Assignment|
Owner name: HITACHI MAXELL, LTD., JAPAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HITACHI CONSUMER ELECTRONICS CO., LTD.;HITACHI CONSUMER ELECTRONICS CO, LTD.;REEL/FRAME:033694/0745
Effective date: 20140826
|Aug 19, 2015||FPAY||Fee payment|
Year of fee payment: 8